Building JRuby from Source
==========================

NOTE: needs maven-3.x

JRuby uses Maven for building and bootstrapping itself, along with Rake,
RSpec, and MSpec for running integration tests.

Bootstrapping JRuby
-------------------

The first time you enter a new source dump of JRuby (from a src zip or
from a git clone), you will want to fully bootstrap the environment. The
command to execute is:

```
mvn
```

Or if you prefer to be more explicit, the default "package" goal can
be specified:

```
mvn package
```

This will do all of the following:

* Compile JRuby
* Build `lib/jruby.jar`, needed for running at command line
* Install `rake`, `rspec`, `jruby-launcher`, and a few other gems for running tests

The environment is now suitable for hacking JRuby and running all test
targets via Rake.

Bootstrapping only needs to be done once at first entry into a JRuby
source dump or if you would like to ensure you're bootstrapped with
updated gems.

Running JRuby
-------------

*Note: RVM users must first run:*

```
rvm use system
```

*to make sure you do not use another Ruby's gems or execute another Ruby implementation.

Once bootstrapped, JRuby can be run with the `build/jruby` executable. If
the `jruby-launcher` gem installed successfully, this will be a native
executable for your platform; otherwise, it will be a copy of the
`bin/jruby.bash` bash script.

Bootstrapping will install the following gems:

* `rake`
* `rspec`
* `jruby-launcher`
* `minitest`
* `minitest-excludes`
* `rdoc`

and dependencies of these gems. A list of the gem versions can be found in
`test/pom.xml` in the `dependencies` section.

RubyGems is installed by default, and available in `bin/gem`. It will
attempt to locate the `jruby` executable using `/usr/bin/env`, so you
will need the `bin` dir in your `PATH` environment or you will need to
call it via JRuby using `jruby -S gem ...`.

The `-S` flag will run any script installed in JRuby's bin dir by RubyGems.
This can be a simple way to ensure you're running the JRuby (or Ruby) version
you think you are.

Testing
-------

JRuby employs a large suite of tests, so there are many ways you can
verify that JRuby is still fully functional.

### Day to Day

For normal day-to-day testing, we recommend running the Ruby 1.9 tests
via the following rake command:

```
rake test:mri19
```

This is a reasonably good suite that does not take too long to run. For
more complete assurance, you can also run 1.9 RubySpecs via the
following command:

```
jruby spec/mspec/bin/mspec ci
```

And if you are making changes that would affect JRuby's core runtime
or embedding APIs, you should run JRuby's Java-based unit tests via

```
mvn -Ptest test
```

### Just Like CI

Our [CI](https://travis-ci.org/jruby/jruby) runs the following three commands (in essence):

```
rake test:extended
jruby spec/mspec/bin/mspec ci
jruby --1.8 spec/mspec/bin/mspec ci
```

The complete CI test suite will take anywhere from 20 to 45 minutes to
complete, but provides the most accurate indication of the stability of
your local JRuby source.

Distribution Packages
---------------------

###the tar.gz and zip distribution packages###

```
mvn -Pdist
```

the files will be found in ./maven/jruby-dist/target

###jruby-complete.jar###

```
mvn -Pcomplete
```

the file will be in ./maven/jruby-complete/target

###jruby maven artifacts###

```
mvn -Pmain
```

and those files will be installed in you maven local-repository ready to use with maven, ivy, buildr, etc

###jruby jars gem###

```
mvn -Pjruby-jars
```

the gem will be in ./maven/jruby-jars/target

### gems - excluding jruby jars gem###

```
mvn -Pgems
```

the gem will be in ./maven/gems/*/pkg

### building ALL packages ###

```
mvn -Pall
```

